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The Duchess of Cornwall will attend a writing workshop in London later this week

DJ Chris Evans is to broadcast from St James's Palace after enlisting the support of the Duchess of Cornwall for his children's short story contest.

Now in its fifth year, 500 words challenges under-13s to write a story about any fictional topic they choose.

Fifty finalists will be invited to the palace in May, where Evans will announce the winners live on Radio 2.

The Duchess, a patron of the National Literacy Trust, will attend a special writing workshop as part of the launch.

The "all-star story laboratory" will take place at Weston Park Primary School, London, on Wednesday.

Authors Frank Cottrell Boyce, Malorie Blackman and Francesca Simon, who are on the 500 Words judging panel, will give advice at the session, which will be filmed and made available to schools across the UK.

Evans said: "We couldn't believe our luck when HRH the Duchess of Cornwall invited us to hold our live on-air final in the stunning surroundings of St James's Palace. She's a supporter of the competition and cannot wait to meet and greet this year's 50 finalists on the day."

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The competition is now in its fifth year

The winners will have their stories narrated by a selection of famous names - last year's included Benedict Cumberbatch and Hugh Bonneville.